var MongoClient = require("mongodb").MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/runoob'; // 数据库为 runoob


var selectData = function(db,callback){
    //连接到表 site
    var collection = db.collection('site');
    //查询数据
    var wherestr = {'name':'菜鸟教程'};
    collection.find(wherestr).toArray(function(err,result){
        if(err)
        {
            console.log('Error:'+ err);
            return;
        }
        callback(result);
    });
}

MongoClient.connect(DB_CONN_STR, function(err, db) {
    console.log("连接成功！");
    selectData(db, function(result) {
        console.log(result);
        db.close();
    });
});